Reaction Injection Molding

Overview
Two reactive materials are injected into a closed mold.  They polymerize and set to final shape within the mold.

Raw Material
Two part thermoset polymers commonly used for the RIM process include dicyclopentadiene (DCPD) and polyurethane.  Reinforcing materials can be added as well, but are not necessary to make high strength, impact resistant parts.

Tooling
Two piece aluminum molds are typically used for the RIM process.

Finishing
Most RIM parts accept paint very well and can be fabricated in the same manner as other composite materials.

 

Benefits Disadvantages
  • Good for higher volume programs
  • Good for exterior, impact resistant applications
  • Can create Class A surface finish
  • Typically lower tensile strength than most thermoset systems
  • Some RIM polymers require sealing the surface after molding to prevent oxidation

 

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